Heat insulating transmission line, vacuum insulating chamber, wireless communication system

Abstract

A heat insulating transmission line includes a first waveguide with a first aperture end, a second waveguide with a second aperture end, and a reflector. The second waveguide is arranged coaxially with the first waveguide. The second aperture end faces the first aperture end through an air gap. The reflector is provided outside the air gap, and controls radiation power from the air gap. In addition, the reflector is substantially parallel to a portion of a virtual plane connecting an inner wall of the first aperture end of the first waveguide and an inner wall of the second aperture end of the second waveguide. When a mean frequency of a signal transmitting through the heat insulating transmission line is expressed as λ, a distance between the virtual surface and the reflector is not less than N×λ / 2−0.05λ and not more than N×λ / 2+0.2λ (N is a positive integer).

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is a division of and claims the benefit of priority under 35 U.S.C. §120 from U.S. Ser. No. 12 / 638,428 filed Dec. 15, 2009, and claims the benefit of priority under 35 U.S.C. §119 from Japanese Patent Application No. 2008-332079 filed Dec. 26, 2008, the entire contents of each of which are incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to a heat insulating transmission line used for propagating a radio frequency signal, a vacuum insulating chamber, and a wireless communication system using the same.DESCRIPTION OF THE BACKGROUND[0003]A communication system which performs information communication by wireless or wire is constituted by various radio frequency components such as an amplifier, a mixer, and a filter. As a method to connect these components, there exist various methods for connecting by a coaxial line or a waveguide, or by a planer circuit such as a strip line, a micros...

AI Technical Summary

Benefits of technology

This configuration achieves excellent heat insulation and low insertion loss while maintaining a simple structure, effectively controlling radiation power and reducing thermal transfer, thus addressing the limitations of existing metal-based transmission lines.

Problems solved by technology

However, since the waveguide employs a metal, the waveguide tends to be heavy to handle, and have a low electrical resistance.

For this reason, there has been a problem that a temperature control for a connection circuit becomes difficult.

However, in any of the above-mentioned waveguides, the metal portions thereof are connected with each other, thereby causing a thermal release.

However, such a low heat conductivity metal has a high electrical resistance, thereby making it difficult to acquire a heat insulating transmission line with a low loss.

However, the method gives rise to heat transfer into the inside of the chamber, because metal parts of the connectors are connected to the inside thereof.

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